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2x4 - 26x2 + 72 = 0

Divide each side by 2:

x4 - 13x2 + 36 = 0

(x2 - 9) (x2 - 4) = 0

A). x2 - 9 = 0

B). x2 - 4 = 0

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A). (x + 3) (x - 3) = 0

x = +3

x = -3

B). (x + 4) (x - 4) = 0

x = +4

x = -4

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15y ago

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